<template>
  <!--
    onmouseenter="" onmouseleave="" 进入 离开
    onmouseover="" onmouseout="" 进入 出去

    画图理解
  -->
  <li @mouseenter="handleEnter(true)" @mouseleave="handleEnter(false)" :style="{background:bgColor}">
    <label>
      <input type="checkbox" v-model="todo.complete"/>
      <span>{{todo.title}}</span>
    </label>
    <button class="btn btn-danger" style="display:block" v-show="isShow" @click="deleteItem">删除</button>
  </li>
</template>

<script>
  export default {
    name: "TodoItem",
    props: {
      index: {
        type: Number,
        required: true
      },
      todo: {
        type: Object,
        required: true
      },
      deleteTodo: {
        type: Function,
        required: true
      }
    },
    data() {
      return {
        bgColor: 'white', // 默认的背景颜色
        isShow: false // 按钮默认是否显示
      }
    },
    methods: {
      // 处理鼠标移入移出事件
      handleEnter(isEnter) {
        console.log("handleEnter......")
        // debugger
        if (isEnter) {
          this.bgColor = '#aaaaaa';
          this.isShow = true;
        } else {
          this.bgColor = 'white';
          this.isShow = false;
        }
      },
      // 删除
      deleteItem() {
        if (window.confirm(`确定${this.todo.title}删除吗？`)) {
          this.deleteTodo(this.index);
        }
      }
    }
  }
</script>

<style scoped>
  /*item*/
  li {
    list-style: none;
    height: 36px;
    line-height: 36px;
    padding: 0 5px;
    border-bottom: 1px solid #ddd;
  }

  li label {
    float: left;
    cursor: pointer;
  }

  li label li input {
    vertical-align: middle;
    margin-right: 6px;
    position: relative;
    top: -1px;
  }

  li button {
    float: right;
    display: none;
    margin-top: 3px;
  }

  li:before {
    content: initial;
  }

  li:last-child {
    border-bottom: none;
  }
</style>
